US6496661B2 - Sheet attachment detecting apparatus, fixing apparatus and image forming apparatus - Google Patents

Sheet attachment detecting apparatus, fixing apparatus and image forming apparatus Download PDF

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Publication number
US6496661B2
US6496661B2 US09/774,587 US77458701A US6496661B2 US 6496661 B2 US6496661 B2 US 6496661B2 US 77458701 A US77458701 A US 77458701A US 6496661 B2 US6496661 B2 US 6496661B2
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US
United States
Prior art keywords
sheet
rotary member
attachment
fixing
electrically conductive
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US09/774,587
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English (en)
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US20010028801A1 (en
Inventor
Masao Ando
Takayasu Yuminamochi
Tomohiro Nakamori
Yasunari Kobaru
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Canon Inc
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Canon Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Canon Inc filed Critical Canon Inc
Assigned to CANON KABUSHIKI KAISHA reassignment CANON KABUSHIKI KAISHA ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: NAKAMORI, TOMOHIRO, KOBARU, YASUNARI, YUMINAMOCHI, TAKAYASU, ANDO, MASAO
Publication of US20010028801A1 publication Critical patent/US20010028801A1/en
Application granted granted Critical
Publication of US6496661B2 publication Critical patent/US6496661B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/20—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat
    • G03G15/2003—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat
    • G03G15/2014—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat using contact heat
    • G03G15/2017—Structural details of the fixing unit in general, e.g. cooling means, heat shielding means
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/20—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat
    • G03G15/2003—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat
    • G03G15/2014—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat using contact heat
    • G03G15/2017—Structural details of the fixing unit in general, e.g. cooling means, heat shielding means
    • G03G15/2028—Structural details of the fixing unit in general, e.g. cooling means, heat shielding means with means for handling the copy material in the fixing nip, e.g. introduction guides, stripping means
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/00362—Apparatus for electrophotographic processes relating to the copy medium handling
    • G03G2215/00535—Stable handling of copy medium
    • G03G2215/00548—Jam, error detection, e.g. double feeding

Definitions

  • the present invention relates to a sheet attachment detecting apparatus that is capable of detecting a phenomenon that a sheet is attached around a rotary member that conveys the sheet when the phenomenon occurs, and a fixing apparatus and an image forming apparatus each having the sheet attachment detecting apparatus.
  • the fixing apparatus which is made up of a pair of rollers consisting of a fixing roller having a heater therein and a pressure roller that presses the sheet under a predetermined pressure to the fixing roller is widely employed because it is simple in structure.
  • This phenomenon is not limited to the rollers in the fixing apparatus, but may occur in any roller in the case where the sheet is conveyed by the rollers.
  • the present invention has been made to solve the above problem, and therefore an object of the present invention is to provide a sheet attachment detecting apparatus that is capable of detecting a phenomenon that a sheet is attached around (wound round) a rotary member that rotates to convey the sheet when the phenomenon occurs, and a fixing apparatus and an image forming apparatus each having the sheet attachment detecting apparatus.
  • a representative structure comprising: a rotary member which is rotatable for conveying a sheet and whose surface is electrically conductive; an electrically conductive member which can be abutted on and separated from the surface of the rotary member; and an attachment detecting means which applies a power to the rotary member and the electrically conductive member for detecting the attachment of the sheet around the rotary member.
  • the sheet when the sheet is attached around the rotary member, the sheet exists between the electrically conductive member and the rotary member. As a result, a potential difference is different between a case where a sheet does not exist between the electrically conductive member and the rotary member and a case where a sheet exists therebetween when the power is applied to the electrically conductive member. Accordingly, the attachment of the sheet around the rotary member is detected by detecting a voltage across the electrically conductive member.
  • the present invention is structured as described above, the attachment of the sheet around the rotary member can be detected. For that reason, the severe jamming can be prevented in advance by stopping the drive of the apparatus or the like at the time when the attachment of the sheet around the rotary member is detected.
  • FIG. 1 is a structurally explanatory diagram showing a laser beam printer in accordance with an embodiment of the present invention
  • FIG. 2 is a perspective explanatory diagram showing a sheet attachment detecting means in a fixing means
  • FIGS. 3A and 3B are explanatory diagrams showing a detection state and an undetection state of the sheet attachment detecting means
  • FIG. 4 is an explanatory diagram showing a sheet attachment detecting circuit
  • FIG. 5 is a flowchart showing a sheet attachment detecting procedure
  • FIG. 6 is a flowchart showing an attachment preventing means in accordance with a second embodiment of the present invention.
  • FIG. 1 is a structurally explanatory diagram showing a laser beam printer in accordance with an embodiment of the present invention.
  • FIG. 2 is a perspective explanatory diagram showing a sheet attachment detecting means in a fixing means.
  • FIGS. 3A and 3B are explanatory diagrams showing a detection state and an undetection state of the sheet attachment detecting means.
  • FIG. 4 is an explanatory diagram showing a sheet attachment detecting circuit.
  • FIG. 5 is a flowchart showing a sheet attachment detecting procedure.
  • the image forming apparatus is directed to a laser printer of the electrophotographic type.
  • This image forming apparatus includes a deck 1 that contains a recording sheet P therein, a deck sheet presence/absence sensor 2 for detecting the presence/absence of the recording sheet P within the deck 1 , a sheet size detecting sensor 3 for detecting the size of the recording sheet P within the deck 1 , a pickup roller 4 for picking up a recording sheet P from the deck 1 , a deck feed roller 5 for conveying the recording sheet P picked up by the pickup roller 4 , and a retard roller 6 paired with the deck feed roller 5 for preventing the double feed of the recording sheet P.
  • downstream downstream of the sheet conveying direction of the deck feed roller 5 (hereinafter referred to simply as downstream), there are provided the deck 1 , a feed sensor 7 for detecting the feed/conveyance state of the sheet from a two-side reversing portion which will be described later, a sheet feed/conveyance roller 8 for conveying the recording sheet P further downstream, a pair of registration rollers 9 that convey the recording sheet P in synchronism with the image forming operation, and an ante-registration sensor 10 for detecting the conveying state of the recording sheet P to the pair of registration rollers 9 .
  • a feed sensor 7 for detecting the feed/conveyance state of the sheet from a two-side reversing portion which will be described later
  • a sheet feed/conveyance roller 8 for conveying the recording sheet P further downstream
  • a pair of registration rollers 9 that convey the recording sheet P in synchronism with the image forming operation
  • an ante-registration sensor 10 for detecting the conveying state of the recording sheet
  • a process cartridge 12 that constitutes an image forming means for forming a toner image on the photosensitive drum on the basis of a laser beam from a laser scanner portion 11 which will be described later is detachably mounted on the apparatus body.
  • the process cartridge 12 includes a rotatable photosensitive drum 12 a , a charging roller 12 b and a developing device 12 c each being disposed around the photosensitive drum 12 a , and also a cleaning unit not shown.
  • the surface of the photosensitive drum 12 a is uniformly charged by the charging roller 12 b , and exposure is selectively conducted by the laser scanner portion 11 to form a latent image, and the latent image is developed with toner by a developing device 12 c so as to be visualized. Then, the toner image is transferred onto the conveyed recording sheet P by applying a transfer bias voltage to the transfer roller 13 to form an image.
  • the fixing apparatus has a sheet attachment detecting apparatus, and its structure will be described later.
  • a fixing discharge sensor 15 for detecting the conveying state from the fixing apparatus B and a duplex-flapper 16 for changing over a path to which the recording sheet P is conveyed from the fixing apparatus B to a discharge portion or a two-side reversing portion. Downstream of the discharge portion side, there are disposed a discharge sensor 17 for detecting the sheet conveying state of the discharge portion, and a pair of discharge rollers 18 for discharging the recording sheet.
  • a pair of reverse rollers 19 for switching back the recording sheet P by forward and reverse rotations there are disposed a pair of reverse rollers 19 for switching back the recording sheet P by forward and reverse rotations, a reverse sensor 20 for detecting the sheet conveying state to the pair of reverse rollers 19 , a D-cut roller 21 for conveying the recording sheet P from a lateral registration portion (not shown) for registering the lateral position of the recording sheet P, a duplex sensor 22 for detecting the conveying state of the recording sheet P of the two-side reversing portion, and a duplex conveying roller pair 23 for conveying the recording sheet P from the two-side reversing portion to the feed portion.
  • the laser scanner portion 11 is made up of a laser unit 11 a for emitting a laser beam modulated on the basis of an image signal sent out from an external device D which will be described later, and a polygon mirror 11 b , a scanner motor 11 c , an imaging lens group 11 d and a return mirror 11 e , for scanning a laser beam from the laser unit 11 a on the photosensitive drum 12 a.
  • reference numeral 24 denotes a high-voltage power supply which includes, in addition to a pressure roller high-voltage circuit which will be described later, a high voltage circuit for applying a desired high voltage to the charging roller 12 b , the developing device 12 c , and the transfer roller 13 .
  • reference numeral 25 denotes a main motor which applies powers to the respective portions.
  • reference numeral 26 denotes a printer controlling portion for controlling the image forming apparatus A which is made up of an MPU (microcomputer) 27 equipped with a RAM 27 a , a ROM 27 b , a timer 27 c , a digital input/output port (hereinafter referred to as “I/O port”) 27 d and so on, and various input/output control circuits (not shown), or the like.
  • MPU microcomputer
  • the printer controlling portion 26 is connected to the external device D such as a personal computer through an interface 28 .
  • the fixing apparatus B is so designed as to thermally fix the toner image transferred onto the recording sheet P, and is made up of a rotatable roller pair consisting of a fixing roller 30 having therein a halogen heater 29 for heating, and a pressure roller 31 as a rotary member a surface of which is electrically conductive. Then, while the recording sheet P onto which the toner image has been transferred is nipped and conveyed by the roller pair, a heat and a pressure are applied to the sheet to permanently fix the toner image onto the sheet.
  • the detecting apparatus C is made up of a conductive brush 32 for applying a high voltage to the surface of the pressure roller 31 , an attachment sensor 33 formed of an electrically conductive member for detecting the attachment of the recording sheet P around the pressure roller 31 , and detecting means for detecting whether a potential difference between the attachment sensor 33 and the conductive brush 32 , that is a voltage across the attachment sensor 33 is larger than a reference value, or not.
  • the attachment sensor 33 is so disposed as to abut against the pressure roller 31 in a sheet passing portion X of the pressure roller 31 downstream, in the pressure roller rotating direction, of separation claws 34 serving as a separating means for separating the recording sheet P from the pressure roller 31 .
  • separation claws 34 serving as a separating means for separating the recording sheet P from the pressure roller 31 .
  • an abutment position Z of the attachment sensor 33 for the pressure roller 31 is opposite to a nip portion of the fixing roller 30 and the pressure roller 31 . That is, in FIG. 2, an upper portion of the pressure roller 31 nips the recording sheet in association with the fixing roller 30 , and the attachment sensor 33 is so disposed as to abut against a lower portion of the pressure roller 31 . As a result, even if a foreign material such as paper dust drops down from the sheet which is conveyed through the nip portion, the paper dust or the like becomes difficult to attach to the abutment portion Z of the pressure roller 31 and the attachment sensor 33 .
  • the attachment sensor 33 is formed of an elastic member which is electrically conductive and flexible and is fixed to an insulating support shaft 35 which is in parallel with the pressure roller 31 and rotatable. In other words, the attachment sensor 33 is disposed so as to be orthogonal to the rotating shaft of the pressure roller 31 .
  • One end of the support shaft 35 is formed with an arm portion 35 a , and a distal end of the arm portion 35 a is swingably supported by a fulcrum 36 b of a plunger 36 a of a solenoid 36 .
  • FIG. 3A shows a state in which the solenoid 36 is de-energized, and a ring 36 c is engaged with the plunger 36 a of the solenoid 36 , and the solenoid is urged upward by a compression spring 36 d . Then, when a current flows in the solenoid 36 , as shown in FIG. 3B, the plunger 36 a is sucked and moved against the compression spring 36 d in a direction indicated by an arrow “a” in FIG. 3 B.
  • the support shaft 35 rotates in a counterclockwise direction. Therefore, the attachment sensor 33 fixed onto the support shaft 35 rotates in a direction indicated by an arrow “b” in FIG. 3 B and then abuts against the surface of the pressure roller 31 in a predetermined force.
  • the abutment force of the attachment sensor 33 against the pressure roller 31 is set to be 0 mN (0 gf) to 980 mN (100 gf).
  • reference numeral 50 denotes an inverter transformer, and an output voltage created at a secondary winding of the inverter transformer 50 is rectified by a doubler voltage rectifying circuit made up of high pressure capacitors 51 , 52 and high pressure diodes 53 and 54 , and thereafter applied to the conductive brush 32 .
  • a primary winding side of the inverter transformer 50 turns on/off a clock signal outputted from an I/O port 27 d of the MPU 27 through a base resistor 55 , a small-signal transistor 56 , a pull-up resistor 57 connected to the collector side of the small-signal transistor 56 and a transistor 58 .
  • a voltage resulting from dividing the output voltage by resistors 59 and 60 is inputted to a minus terminal of an operational amplifier 61
  • a reference voltage resulting from dividing a power supply voltage +24 V by resistors 62 and 63 is inputted to a plus terminal of the operational amplifier 61 .
  • An output of the operational amplifier is adjusted to an input voltage of the inverter transformer through a transformer driver circuit made up of resistors 64 , 65 , a transistor 66 and an aluminum electric field capacitor 67 .
  • the diode 68 is a protective diode of the transistor 66 , and a diode 69 is so designed as to flow a flyback current into an inverter transformer.
  • the plus terminal of the operational amplifier 61 is grounded through a transistor 70 and a resistor 71 by a signal from the I/O port 27 d of the MPU 27 , thereby being capable of making the reference voltage 0 V and the high voltage output turn off.
  • the voltage across the attachment sensor 33 is divided by resistors 72 and 73 , and is then inputted to a minus terminal of a comparator 74
  • the high-voltage output voltage is divided by resistors 75 and 76 , and is then inputted to a plus terminal of the comparator 74 .
  • Those respective resistances are set in such a manner that the plus terminal voltage of the comparator 74 becomes larger than the voltage at the minus terminal if the voltage across the attachment sensor 33 is equal to or less than 85% of the high-voltage output voltage, and the output of the comparator 74 becomes high through a pull-up resistor 77 .
  • An output of the comparator 74 is connected to an input terminal of the I/O port 27 d of the MPU 27 .
  • the comparator 74 outputs a low output.
  • the voltage across the attachment sensor 33 is lowered as compared with a case where no recording sheet exists therebetween, as a result of which the comparator 74 outputs a high signal.
  • the image forming apparatus operates as shown in FIG. 5 in accordance with the detection result by the above detecting circuit. That is, when a power supply is supplied to the apparatus body, the solenoid 36 first turns on, and the attachment sensor 33 abuts against the pressure roller 31 (S 1 ). Then, a voltage is applied to the pressure roller 31 through the conductive brush 32 (S 2 ), and the detection result in the detecting circuit is checked out as described above (S 3 ).
  • the main motor 25 is driven to conduct a predetermined printing (S 4 ), and the solenoid 36 is turned off (S 6 ).
  • the main motor 25 is stopped (S 5 ), and thereafter the solenoid 36 is turned off (S 6 ).
  • the apparatus automatically stops, and the severe jamming is prevented from occurring without the fixing apparatus being driven while the sheet is attached around the roller.
  • the attachment sensor 33 is so disposed as to be orthogonal to the rotating shaft of the pressure roller 31 , when the recording sheet attached around the surface of the pressure roller is removed or when the recording sheet is attached around the pressure roller, even if the attachment sensor 33 is abutted against the surface of the pressure roller due to control trouble, the attachment sensor 33 is merely elastically deformed, thereby being capable of preventing destruction, or the like.
  • FIG. 6 is a flowchart showing an attachment preventing procedure in accordance with the second embodiment.
  • the operational procedure shown in FIG. 6 is different from that of the first embodiment in the operation of Step S 5 in FIG. 5, but identical with that of the first embodiment in other steps.
  • the driving of the apparatus does not stop, but the main motor is reverse-driven for a predetermined period of time as shown in Step S 25 of FIG. 6 .
  • the structure in which the roller around which the sheet is attached is detected is exemplified by the pressure roller 31 .
  • the structure is so modified as to detect the attachment of the sheet on the fixing roller 30 , or to detect the attachment of the sheet around both of the fixing roller 30 and the pressure roller 31 .
  • the sheet attachment detecting mechanism does not need to be limited to the roller of the fixing apparatus. But, the attachment of the sheet around the roller can be detected by the provision of the detecting circuit if the roller conveys the sheet, and if the operation of the apparatus is controlled in accordance with the detection result, the severe jamming can be prevented in advance.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Controlling Sheets Or Webs (AREA)
  • Fixing For Electrophotography (AREA)
US09/774,587 2000-02-03 2001-02-01 Sheet attachment detecting apparatus, fixing apparatus and image forming apparatus Expired - Fee Related US6496661B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2000025848A JP2001213546A (ja) 2000-02-03 2000-02-03 シート巻付検出装置及び定着装置及び画像形成装置
JP2000-025848 2000-02-03

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US20010028801A1 US20010028801A1 (en) 2001-10-11
US6496661B2 true US6496661B2 (en) 2002-12-17

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EP (1) EP1122616B1 (fr)
JP (1) JP2001213546A (fr)
DE (1) DE60131690T2 (fr)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030194252A1 (en) * 2002-04-12 2003-10-16 Canon Kabushiki Kaisha Image forming apparatus
US6643475B2 (en) * 2002-01-18 2003-11-04 Hewlett-Packard Development Company, L.P. Fuser sensor system
US6718146B2 (en) 2001-04-24 2004-04-06 Canon Kabushiki Kaisha Image forming apparatus and image forming method
US6744993B2 (en) 2001-04-24 2004-06-01 Canon Kabushiki Kaisha Sheet winding detecting device and image forming apparatus
US20040202491A1 (en) * 2003-04-14 2004-10-14 Canon Kabushiki Kaisha Image forming apparatus
US20050201789A1 (en) * 2004-03-09 2005-09-15 Canon Kabushiki Kaisha Image forming apparatus
US20070013120A1 (en) * 2005-07-15 2007-01-18 Hewlett-Packard Development Company, Lp Duplexer
US20100172666A1 (en) * 2009-01-07 2010-07-08 Samsung Electronics Co., Ltd. Image forming apparatus and control method thereof
US20130121736A1 (en) * 2011-11-10 2013-05-16 Canon Kabushiki Kaisha Image heating device

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7136007B2 (ja) * 2019-05-30 2022-09-13 王子ホールディングス株式会社 シートの搬送不良検出装置及び搬送不良検出方法

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US4073585A (en) * 1975-09-26 1978-02-14 Rank Xerox Ltd. Sheet removing device for use in electrophotographic copying machine
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US4073585A (en) * 1975-09-26 1978-02-14 Rank Xerox Ltd. Sheet removing device for use in electrophotographic copying machine
US4239372A (en) * 1977-10-27 1980-12-16 Konishiroku Photo Industry Co., Ltd. Transfer type electrophotographic copying machine
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US5386983A (en) 1990-07-13 1995-02-07 Canon Kabushiki Kaisha Sheet feeding apparatus with reduced generation of static electricity
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Cited By (17)

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Publication number Priority date Publication date Assignee Title
US6718146B2 (en) 2001-04-24 2004-04-06 Canon Kabushiki Kaisha Image forming apparatus and image forming method
US6744993B2 (en) 2001-04-24 2004-06-01 Canon Kabushiki Kaisha Sheet winding detecting device and image forming apparatus
US6782214B2 (en) 2002-01-18 2004-08-24 Hewlett-Packard Development Company, L.P. Fuser sensor system and method with media detection
US6643475B2 (en) * 2002-01-18 2003-11-04 Hewlett-Packard Development Company, L.P. Fuser sensor system
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US20030194252A1 (en) * 2002-04-12 2003-10-16 Canon Kabushiki Kaisha Image forming apparatus
US20040202491A1 (en) * 2003-04-14 2004-10-14 Canon Kabushiki Kaisha Image forming apparatus
US7203440B2 (en) 2003-04-14 2007-04-10 Canon Kabushiki Kaisha Image forming apparatus with a plurality of selectable modes to maintain temperature
US20050201789A1 (en) * 2004-03-09 2005-09-15 Canon Kabushiki Kaisha Image forming apparatus
US7280798B2 (en) 2004-03-09 2007-10-09 Canon Kabushiki Kaisha Image forming apparatus with conveying device urging a recording material toward a charge eliminating member
US20070013120A1 (en) * 2005-07-15 2007-01-18 Hewlett-Packard Development Company, Lp Duplexer
US7731184B2 (en) 2005-07-15 2010-06-08 Hewlett-Packard Development Company, L.P. Duplexer
US20100172666A1 (en) * 2009-01-07 2010-07-08 Samsung Electronics Co., Ltd. Image forming apparatus and control method thereof
US8548370B2 (en) * 2009-01-07 2013-10-01 Samsung Electronics Co., Ltd. Image forming apparatus and control method thereof
US20130121736A1 (en) * 2011-11-10 2013-05-16 Canon Kabushiki Kaisha Image heating device
US8879974B2 (en) * 2011-11-10 2014-11-04 Canon Kabushiki Kaisha Image heating device with a belt lateral shifting direction regulating mechanism

Also Published As

Publication number Publication date
EP1122616A2 (fr) 2001-08-08
US20010028801A1 (en) 2001-10-11
EP1122616A3 (fr) 2003-07-09
DE60131690T2 (de) 2008-11-20
DE60131690D1 (de) 2008-01-17
JP2001213546A (ja) 2001-08-07
EP1122616B1 (fr) 2007-12-05

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